Gmail Checker Lite (multi-account)

Does what it says. Supports up to two accounts at the same time. No fancy features.

A simple extension that checks your Gmail inbox and displays the unread count with a nice icon/badge. Also, sound notifications available. Probably one of the few that let you choose the feed you want. 'Primary' or 'All e-mail' are the ones available! Supports the new Inbox from Google and you have up to two accounts at the same time being checked password-less, which is great!
Changelog:
[0.3.x]
- MULTI ACCOUNT SUPPORT! Hell yeah, finally.
[0.2.7]
- New icons
- Retina support
[0.2.6]
- Hotfix for the new feature. Added proper default values.
- Added new permissions for inbox.google.com
[0.2.5]
- New feature: added support for the new Google Inbox. Choose your default app in the options page! Gmail users, don't worry, it's the default app.
[0.2.4]
- New feature: choose your feed. 'Primary' category and 'All e-mails' available!
[0.2.3]
- Minor improvements
- Enhancement: always check the primary account inbox
[0.2.2]
- New feature: icon click behaviour now can be changed to open the primary account tab or the first gmail.com found in the list.
[0.2.1]
- Core methods refactored
- Fixed bug related with the check cycle
[0.2.0]
- New feature: sound notifications for everyone. Take your eyes off the screen.
[0.1.2]
- Added "Options" page with alternative icons and check-cycles
[0.0.2]
- First release
About:
Yes, it's open source. You can contribute to the development here: https://github.com/rafaqueque/gmail-checker-lite